Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Common Stock	AOCI
Balance at Dec. 31, 2012		$ 1,741	$ 1,176	$ 27,205	$ (18,462)	$ (699)
Net income	$ 2,162	0	0	2,162	0	0
Dividends declared and paid ($1.07, $1.24, and $1.40 per share in 2013, 2014, and 2015)		0	0	(1,175)	0	0
Common stock issued for stock-based awards		0	(273)	0	1,540	0
Stock repurchases		0	0	0	(2,868)	0
Stock-based compensation		0	287	0	0	0
Tax impact from exercise of options	227	0	25	0	0	0
Other comprehensive income (loss), net of taxes	171	0	0	0	0	171
Dividend equivalents paid on restricted stock units		0	0	(19)	0	0
Other		0	(4)	0	0	0
Balance at Dec. 31, 2013		1,741	1,211	28,173	(19,790)	(528)
Net income	2,821	0	0	2,821	0	0
Dividends declared and paid ($1.07, $1.24, and $1.40 per share in 2013, 2014, and 2015)		0	0	(1,323)	0	0
Common stock issued for stock-based awards		0	(226)	0	781	0
Stock repurchases		0	0	0	(2,831)	0
Stock-based compensation		0	277	0	0	0
Tax impact from exercise of options	218	0	110	0	0	0
Other comprehensive income (loss), net of taxes	(4)	0	0	0	0	(4)
Dividend equivalents paid on restricted stock units		0	0	(18)	0	0
Other		0	(4)	0	0	0
Balance at Dec. 31, 2014	10,390	1,741	1,368	29,653	(21,840)	(532)
Net income	2,986	0	0	2,986	0	0
Dividends declared and paid ($1.07, $1.24, and $1.40 per share in 2013, 2014, and 2015)		0	0	(1,444)	0	0
Common stock issued for stock-based awards		0	(116)	0	513	0
Stock repurchases		0	0	0	(2,741)	0
Stock-based compensation		0	286	0	0	0
Tax impact from exercise of options	171	0	90	0	0	0
Other comprehensive income (loss), net of taxes	0	0	0	0	0	0
Dividend equivalents paid on restricted stock units		0	0	(19)	0	0
Other		0	1	0	0	0
Balance at Dec. 31, 2015	$ 9,946	$ 1,741	$ 1,629	$ 31,176	$ (24,068)	$ (532)